Tappet wrench



June 20, 1933. HAMMERICH 1,914,827

TAPPET WRENCH Filed May 1, 1931 INVENTOR. fk/rz A/VAMME/e/c/q A TTORNEYS.

Patented June 20, 1933 UNETE STATES PATENT F F E TAPPET WRENCH Application filed May 1,

This invention relates to flat wrenches and has for its objects a simplified construction which will positively look a pair of flat wrenches in a variety of positions when applied to the tappet of an automobile engine, also which will permit other wrenches to be used on the nut or tappet at either end while realizing the same locking advantages.

Another feature of the invention is that it is always in position for instant use and avoids any thumb screws or manipulatory devices on the wrenches.

In the drawing Fig. 1 is a perspective view of a pair of wrenches made in accordance with my invention in position on an engine tappet and with a third wrench on the adjusting nut.

Fig. 2 is an enlarged plan view of a portion of one of the locking wrenches.

Fig. 3 is an enlarged broken plan view of a portion of the other of the locking wrenches.

Fig. 4 is a side or edge view of the wrench of Fig. 3.

In further detail, 1 is the cam shaft of an engine, 2 one of the valve cams, 3 the tappet plate resting on the cam, at the tappet which works up and down and is also free to revolve in bearing sleeve 5. 6 is either the valve stem or the rocker rod, depending on the type of engine, and which rod or stem rests upon an adjusting screw 7 threaded into the tappet and is locked in adjusted position by means of a lock nut 8. Various modifications of this arrangement are used on the different makes of engines, but the principle of operation is about as shown.

The sides of the tappet 4 are flattened as at 4: so that it may be held with a wrench when loosening or tightening the nut 8 in adjusting the screw 7 to give the proper clearance to the valve, and to carry out the operation it is difficult for a mechanic to hold the various parts from turning at the moment of final tightening of the check nut and the exact clearance obtained is consequently largely a matter of chance. In doing this work a mechanic usually uses several flat wrenches, one (9) on the tappet, another (10) on the check nut and another 1931. Serial No. 534,180.

(11) on the adjusting screw, and as the first two should be held in fixed relation during the adjustment of the screw there have been devices made to accomplish this, but they have generally been unsatisfactory as'well as complicated, and my invention accomplishes the desired result in a very simple manner as follows On one of the flat wrenches (9) I provide a centrally arranged stud or pin 12 projecting from both sides, while on the other wrench (10) I provide a flat side arm 13 having a plurality of holes 14 arranged in two series or rows, each respectively on an are 1 1, 14L struck from the nut center of opposite ends of the wrench. The pin 12 is of a size to pass freely into any of the holes and is necked down a trifle as indicated so that it will not slip out when a little pressure or side friction is put upon it by holding the wrenches together, as by one hand of the mechanic.

By the arrangement described either end of either wrench may be used on the screw or tappet, or either wrench may be turned over to either side so as to gain the advantage of the different jaw angles, and in all positions the pin 12 will be in proper relation to fit into a hole, at least by slight turning movement which may be disregarded in .practice.

Thus with the wrenches as equipped, the nut 8 may be just slacked off to permit forcible turning of the adjusting screw 7, wrenches 9 and 10 locked by the pin and easily held by one hand while the screw is adjusted with the other, and whereupon, by lifting the arm out of engagement with the pin and squeezing the wrenches 9 and 10 together the slight slack in nut 8 will be taken up to lock the assembly without losing the adjustment, as the closing movementof wrenches 9 and 10 will always be a deft nite distance depending on the hole used to lock wit-h the pin.

Having thus described my invention I claim:

1. A spanner wrench having a head adapted to engage a nut and a shank eX tending therefrom, an arm extending laterally from and rigid with said shank and having an arcuate row of pin receiving openings concentric with the center of said head; in combination with a second spanner wrench having a head and a shank extending rigidly therefrom, and a pin fixed to the second shank at a distance from the center of its head equal to the distance of the holes from the center of the head of the first wrench and adapted for selective engagement with said holes.

2. A double ended spanner wrench hav ing a pair of nut engaging heads and a shank rigidly connecting said heads, a pair of arms extending laterally from and rigid with said shank and arcnately curved in opposite directions to lie concentric with the centers of respective heads, each of said arms being provided With a row of spaced holes concentric with a respective head; in combination with a second double ended spanner Wrench having a pair of heads and a shank rigidly connecting said heads, and a pin fixedly located centrally of said shank and adapted for selective engagement in said holes, the distance between the centers of the heads of the first Wrench being equal to the distance between the centers of the heads of the second Wrench.

FRITZ A. HAMMERIGH. 

